AutoCodes – GMC – P037B 2017 GMC Sierra

P037B 2017 GMC Sierra Code - Wait To Start Indicator Control Circuit High Voltage

Quick Answer

Ignition voltage is supplied directly to the Wait To Start indicator. Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P037B 2017 GMC Sierra indicates Wait To Start Indicator Control Circuit High Voltage.
Common causes: Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 159

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 17, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P037B 2017 GMC Sierra Description

Ignition voltage is supplied directly to the Wait To Start indicator. The Engine Control Module (ECM) controls the lamp by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line which is monitored by the ECM. When the ECM is commanding a component ON, the voltage of the control circuit should be low, near zero volts. When the ECM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high, near battery voltage. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to voltage on the Wait To Start Indicator Control circuit for greater than 1 s.

OBDII Code P037B 2017 GMC Sierra - Wait To Start Indicator Control Circuit High Voltage - AutoCodes.com — P037B 2017 GMC Sierra Code - Wait To Start Indicator Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P037B 2017 GMC Sierra?

Faulty Instrument Cluster
Instrument Cluster harness is open or shorted
Instrument Cluster circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P037B 2017 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P037B 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P037B 2017 GMC Sierra code?

Need more information on how to fix the P037B 2017 GMC Sierra code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P037B 2017 GMC Sierra Code

What does the OBDII code P037B mean on a 2017 GMC Sierra?

Code P037B indicates a high voltage issue in the Wait To Start Indicator Control Circuit, which is part of the diesel engine's glow plug system.

What are the common symptoms of the P037B code?

Symptoms may include the Wait To Start indicator not illuminating, extended engine cranking times, or difficulty starting the engine in cold weather.

What causes the P037B code on a GMC Sierra?

Common causes include a faulty Wait To Start indicator bulb, damaged wiring or connectors in the circuit, or a malfunctioning engine control module (ECM).

Can P037B affect engine performance?

Yes, it can make the engine harder to start, particularly in cold conditions, since the glow plug system may not function as intended.

How do I diagnose the P037B code?

Inspect the Wait To Start indicator bulb, check for damaged wiring or loose connections in the circuit, and test the ECM for proper functionality.

Can I still drive my GMC Sierra with the P037B code?

Yes, the vehicle can still be driven, but starting the engine may be difficult, especially in colder weather, and the underlying issue should be addressed promptly.

How do I fix the P037B code?

Repairs may include replacing the Wait To Start indicator bulb, repairing wiring or connectors, or replacing the ECM if it is found to be defective.

Does the P037B code mean my glow plugs are bad?

Not necessarily. This code relates to the control circuit for the Wait To Start indicator, not directly to the glow plugs themselves.

Can a dead battery cause the P037B code?

A weak or dead battery is unlikely to cause this specific code, but electrical issues could contribute to related problems in the circuit.

Do I need a professional to fix the P037B code?

If youâ€™re comfortable diagnosing electrical circuits and replacing components, you may be able to fix it yourself. Otherwise, professional assistance is recommended.